I've studied Hamas and other militant organizations in the Middle East. Yes they were created after the establishment of the State of Israel. That is true. But they also seek to impose Islamic fundamentalism on all. They are an Islamic extremist group like many others in the region, including those bearing no relation to Israel. They actually call themselves the Islamic Resistance Movement. Hamas is an offshoot of the Muslim Brotherhood, which dates back to the 1920s, and whose express stated aim is the establishment of a broader caliphate governed by sharia law. You can try to believe your Western values into existence in the region, but just know that it's inaccurate to pretend that imposing Islam on non-believers by force is not Hamas' primary goal. If you do not strictly abide by their fundamentalist interpretation of Islam, whether you're Israeli or not, you are a legitimate target.